3d spiral Stair help

[Shibuboss]

Hi,

Please help me to slice the spiral stair as per the section.

 

Thanks and Regards.test.dwg

[ReMark]

Before we begin did you know that although your section detail shows the height of each step to be 180 the 3D model has the step height as 175? Which one is incorrect?

 

I think JD Mather may have come up with a solution to your problem in another thread about 3D stairs. Have you checked the Similar Threads listed below to done a search of the forums on spiral stairs?

Edited September 30, 2013 by ReMark

[ReMark]

My attempt thus far resulted in something along these lines. Would that work for you?

[SLW210]

I moved your thread to the AutoCAD 3D Modelling & Rendering forum, please try to create your threads in an appropriate forum, it helps YOU get more appropriate responses.

[JD Mather]

Sweep a line on your Helix as a Surface.

Then Slice with Surface.

[ReMark]

How does one keep the single line from going flaky? That was my initial approach but I got a weird result.

 

Update. I think I may have figured out what I was doing wrong. Some further testing required.

 

Curses...foiled again. AutoCAD doesn't like me. It looked good though.

 

Select a surface:

The Boolean operation on solid and/or surface bodies failed.

 

Modeling Operation Error:

Inconsistent face-body relationships.

 

SLICE failed for selected solid.

Edited September 30, 2013 by ReMark

[ReMark]

I may have worked it out. Probably not with as much finesse as JDM however.

[Shibuboss]

Good morning sir,

 

Thanks for your responds. exactly i need the same detail. can you please explain me the way you create the stair.the riser height is 175mm.

 

Thanks&Regards,

[JD Mather]

Sweep a line along the Helix and then Slice with Surface.

The line must be wider than the stair so that the resulting surface completely slices the solid.

[Shibuboss]

Sir,

i am a beginner in auto cad 3d. so can you please show me how to do it? i mean.. can you post some images for the same.

 

Thanks

[ReMark]

Do this using a copy of your geometry. Visual style is 2Dwireframe.

 

First. Union your steps so you have but one solid model.

Edited October 1, 2013 by ReMark

[ReMark]

Second. Draw a line longer than the width of your stair. Mine (the white one in the image) was 1125 units. Locate the midpoint of this line on the midpoint of the bottom of your first step. This line, as JDM said, must overhang both sides of the stairs.

 

Third. Reorient your UCS and move both the line you drew and your helix downward 120 units.

[ReMark]

Fourth. Sweep the line you drew along the helix.

[ReMark]

Fifth. Use the SLICE command with the SURFACE option to slice the stairs. I kept both sides and changed the color of the lower portion to red so you can see it here (visual style is Realistic). This, along with your swept line and helix, is erased to achieve the final result as per the image I posted yesterday.

Edited October 1, 2013 by ReMark

[Shibuboss]

Sir,

 

Thanks for your detailed explanation.

how much height you gave to the helix, it's perfectly passing through the edge of each riser.i tried but it's not passing through the actual point.please advise.

 

Regards,

[ReMark]

I used the helix that you provided and the only thing I did to it was move it down 120 units. The helix does not get a height. Look at the image below.

 

See the three red circles? They show us that the line that was swept along the helix, to form the cutting surface, extends beyond the sides and below the bottom of our solid model. That surface is used to slice the stairs.

 

Now it is your turn. Try again.

Edited October 2, 2013 by ReMark